In muscle anatomy, where is the insertion located?

The insertion of a muscle is defined as the point where the muscle attaches to a bone that moves when the muscle contracts. This is typically located farthest from the skeleton or the central point of attachment, which is known as the origin. The movement generated by muscle contraction occurs at the insertion site as the muscle shortens, bringing the attachment point closer to the origin, allowing for various movements within the body.

The other options present definitions that do not align with the primary characteristics of muscle anatomy. For example, the fixed point of muscle attachment pertains to the origin, not the insertion, while the middle of the muscle does not specifically denote either attachment point. Being closest to the skeleton would imply an origin rather than an insertion. Hence, identifying the insertion as the point farthest from the skeleton accurately reflects its anatomical role.